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2 years ago

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What is the friction

1 answer:

Mnenie [13.5K]2 years ago

3 0

Explanation:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in

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Maggie is using her cat in an experiment on animal intelligence. Which of the following statements is true?

Kamila [148]

1. If Maggie gives her cat an unfair advantage, her experimental results will be biased.

Explanation:

Maggie using her cat in the experiment to test for intelligence gives the cat an unfair advantage, her experimental results will be biased.

Due to her emotional attachment with the cat, the experimental results will be skewed to portraying her cat as intelligence.
This is not a good experiment to carry out.
Such an experiment should be carried out with an unknown cat.

learn more:

Experiment brainly.com/question/1621519

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What is it that lives if it is fed, and dies if you give it a drink?

IceJOKER [234]

A fire because you feed it wood, it lives longer but if you give it a drink, water, then it dies.

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2 years ago

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VLD [36.1K]

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she will eventually slow down and come to a stop

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A baseball player hits a baseball at an angle of 30 degrees above the horizontal. The baseball’s initial speed is 35 m/s.

Paul [167]

The ball's velocity at 2 sec is 30.4 m/s at $-4.0^{\circ}$ (below the horizontal)

Explanation:

The motion of the ball is a projectile motion, therefore it consists of two independent motions:

- A uniform motion (constant velocity) along the horizontal direction

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction

This means that:

- The horizontal velocity of the ball is constant, and it is given by

$v_x = u cos \theta$

where

u = 35 m/s is the initial speed of the ball

$\theta=30^{\circ}$ is the angle of projection

Substituting,

$v_x = (35)(cos 30)=30.3 m/s$

- The vertical velocity is changing, and its value is given by

$v_y = u_y + at$

where

$u_y = u sin \theta = (35)(sin 30)=17.5 m/s$ is the initial vertical velocity

$a=g=-9.8 m/s^2$ is the acceleration of gravity (negative because it points down)

t is the time

At t = 2 s,

$v_y = 17.5 + (-9.8)(2)=-2.1 m/s$

where the negative sign means that at t = 2 s, the vertical velocity points down.

Now we can find the magnitude of the ball's velocity at 2 sec:

$v=\sqrt{v_x^2+v_y^2}=\sqrt{30.3^2+(-2.1)^2}=30.4 m/s$

While the direction is given by

$\theta=tan^{-1}(\frac{v_y}{v_x})=tan^{-1}(\frac{-2.1}{30.3})=-4.0^{\circ}$

Learn more about projectile motion:

brainly.com/question/8751410

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2 years ago